The browser is now a 3D canvas. Three.js, the world's most popular WebGL library, has made building interactive 3D animations accessible to any JavaScript developer. This guide will take you from zero knowledge to your first animated 3D scene.
The Three.js Mental Model
Every Three.js scene is built from the same six fundamental building blocks. Understand these, and every example, tutorial, and demo you ever encounter will click:
- Scene: The virtual world container. Everything that exists lives here.
- Camera: The viewer's perspective. PerspectiveCamera is most common for natural-looking 3D.
- Renderer: The engine that draws the scene to your HTML canvas using WebGL.
- Geometry: The shape data (a box, a sphere, a custom 3D model).
- Material: How the geometry's surface looks (color, shininess, texture, transparency).
- Mesh: The combination of a Geometry and a Material. This is what you actually see.
const scene = new THREE.Scene();
const camera = new THREE.PerspectiveCamera(75, w/h, 0.1, 1000);
const renderer = new THREE.WebGLRenderer();
const mesh = new THREE.Mesh(geometry, material);
scene.add(mesh);
The Animation Loop
Three.js animations work via requestAnimationFrame. You create a function that updates your scene's state (rotating a mesh, moving a camera) and calls itself recursively. The browser calls it before every frame repaint, giving you smooth 60fps motion tied to the display refresh rate.
Essential Three.js Libraries to Know
- @react-three/fiber: A React renderer for Three.js. Declare your 3D scene as JSX components.
- @react-three/drei: A utility library for Fiber with pre-built helpers (OrbitControls, HTML in 3D, loaders).
- Leva: A GUI tool to tweak Three.js properties live in the browser during development.
- GSAP + Three.js: GSAP timelines can animate Three.js object properties for precise, staggered 3D animations.
"Three.js feels like cheating. You're pushing millions of GPU polygons at 60fps, and it looks like magic to the user — but the code is surprisingly approachable."
Conclusion
3D on the web is no longer a niche skill — it's becoming an expectation for premium digital experiences. Start with the fundamentals taught here, and you'll be building award-winning 3D scenes faster than you expect.
CreativeFreedom.
Stop paying for single-use assets. Extract premium Lottie animations, 3D icons, and SVG vectors from IconScout & LottieFiles — instantly, for free.
